refactor: reword locale translations (#12118)

### What problem does this PR solve?

Reword (in locales/en) "Image context window" to "Image & table context
window", etc.

### Type of change

- [x] Refactoring

web/src/locales/en.ts

@@ -371,9 +371,9 @@ Procedural Memory: Learned skills, habits, and automated procedures.`,
       globalIndexModel: 'Indexing model',
       settings: 'Settings',
       autoMetadataTip: `Automatically generate metadata. Applies to new files during parsing. Existing files require re-parsing to update (chunks remain preserved). Be aware that extra tokens will be consumed by the indexing model specified in 'Configuration'.`,
-      imageContextWindow: 'Image context window',
+      imageContextWindow: 'Image & table context window',
       imageContextWindowTip:
-        'Captures N tokens of text above and below the image to provide richer background context for the image chunk.',
+        'Captures N tokens of text above and below the image & table to provide richer background context.',
       autoMetadata: 'Auto metadata',
       mineruOptions: 'MinerU Options',
       mineruParseMethod: 'Parse Method',

web/src/locales/zh.ts

@@ -1813,6 +1813,7 @@ Tokenizer 会根据所选方式将内容存储为对应的数据结构。`,
       keywords: '关键词',
       questions: '问题',
       metadata: '元数据',
+      toc: '目录',
       fieldName: '结果目的地',
       prompts: {
         system: {